CVE-2025-43915: buoyant DoS — Fix

Description

In Linkerd edge releases before edge-25.2.1, and Buoyant Enterprise for Linkerd releases 2.13.0–2.13.7, 2.14.0–2.14.10, 2.15.0–2.15.7, 2.16.0–2.16.4, and 2.17.0–2.17.1, resource exhaustion can occur for Linkerd proxy metrics.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
linkerd	buoyant	2.13.0 — 2.13.7
linkerd	buoyant	2.14.0 — 2.14.10
linkerd	buoyant	2.15.0 — 2.15.7
linkerd	buoyant	2.16.0 — 2.16.5
linkerd	buoyant	2.17.0 — 2.17.2
linkerd	linkerd	< 25.2.1

References

Advisories & Patches

https://docs.buoyant.io/security/advisories/2025-01/

Other References

https://www.buoyant.io/resources

Frequently Asked Questions

What is CVE-2025-43915? +

In Linkerd edge releases before edge-25.2.1, and Buoyant Enterprise for Linkerd releases 2.13.0–2.13.7, 2.14.0–2.14.10, 2.15.0–2.15.7, 2.16.0–2.16.4, and 2.17.0–2.17.1, resource exhaustion can occur for Linkerd proxy metrics. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-43915? +

CVE-2025-43915 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-43915? +

CVE-2025-43915 affects products from linkerd, specifically: buoyant, linkerd. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-43915? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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